57540716021 has 2 divisors, whose sum is σ = 57540716022. Its totient is φ = 57540716020.

The previous prime is 57540715987. The next prime is 57540716053. The reversal of 57540716021 is 12061704575.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57152074225 + 388641796 = 239065^2 + 19714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57540716021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57540736021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28770358010 + 28770358011.

It is an arithmetic number, because the mean of its divisors is an integer number (28770358011).

Almost surely, 2^57540716021 is an apocalyptic number.

It is an amenable number.

57540716021 is a deficient number, since it is larger than the sum of its proper divisors (1).

57540716021 is an equidigital number, since it uses as much as digits as its factorization.

57540716021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58800, while the sum is 38.

The spelling of 57540716021 in words is "fifty-seven billion, five hundred forty million, seven hundred sixteen thousand, twenty-one".